Siding · Service

Siding replacement — and what is behind the old stuff

Whether yours is genuinely finished, what the crew finds when it comes off, and how the in-home close works before someone is sitting at your kitchen table.

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In short

What is siding replacement?

Siding replacement means stripping the existing cladding off the walls, inspecting and repairing what is behind it, renewing the water-resistive barrier, and installing new siding and trim. The re-side itself is well-understood work. The part that moves the price is invisible until day one: nobody, including your contractor, knows the condition of your sheathing and water barrier until the old siding is off the wall.

Triggers

Signs you need siding replacement

Panels are cracked, split, buckled or hanging loose across whole elevations rather than in isolated spots
You can push a screwdriver into the wall sheathing behind a damaged area, or the wall sounds and feels soft
Paint on wood or fiber cement is failing again within a year or two of a repaint, which usually means moisture is coming from behind rather than weather from in front
Interior signs — musty smells on an exterior wall, staining below windows, or peeling paint inside on an outside wall
The colour has faded unevenly to the point where any repair panel will be visibly wrong, which is a real constraint rather than a cosmetic complaint
Repeated repairs in the same area, which almost always means the water barrier or flashing behind the siding has failed rather than the siding itself
You are already re-roofing, re-windowing or adding exterior insulation, which is the cheapest moment a re-side will ever be

Seeing something not on this list? Browse siding problems by symptom →

The job

How siding replacement actually works

Establishing whether it is really a replacement

Look for the difference between damage and a system failure. Isolated cracked panels on an otherwise sound wall are a repair. Failure across whole elevations, or damage that keeps recurring in one place, points at what is behind the siding.

Watch for: A whole-house recommendation made from the driveway. Anyone recommending a re-side should be able to say what they think is behind the siding and why — not just that the outside looks tired.
Measurement and the quote

A real quote is built from wall square footage, opening count, storey height, trim linear footage, and the specific material and profile. Access, landscaping and how many corners the house has all move the labour.

Watch for: A price given before anyone has measured, or a total with no breakdown between material, labour, trim and disposal. You cannot compare two of those, and you cannot tell later what a change should cost.
The tear-off — and the contingency you should have budgeted

The old siding comes off in sections. This is the first and only time anyone sees the sheathing, the water-resistive barrier, the flashing at windows and doors, and any rot or insect damage. Some of it will need work on most older houses.

Watch for: A quote with no stated contingency and no unit price for repairs. Agree in advance what a sheet of replacement sheathing costs and what the hourly rate for repair work is, in writing. Otherwise the moment of maximum leverage for the contractor is the moment your walls are open — and that is a bad time to negotiate.
Sheathing repair and the water-resistive barrier

Damaged sheathing is cut out and replaced. Then the entire wall gets a new water-resistive barrier — house wrap or a building paper — lapped shingle-style so every upper piece overlaps the one below, taped where the system calls for it, and integrated with window and door flashing.

Watch for: New siding going over old house wrap, or over none at all. The barrier is the actual waterproofing of your wall; the siding is a rain screen in front of it. Re-siding without renewing the barrier is the most expensive way to leave the underlying problem exactly where it was.
Flashing and penetrations

Head flashing over windows and doors, kick-out flashing where a roof edge meets a wall, and correct detailing at every hose bib, vent, light and electrical box. These junctions are where nearly all wall water intrusion begins.

Watch for: Sealant used as a substitute for flashing. Caulk is a maintenance item with a service life measured in a few years; flashing is a permanent detail. A wall relying on caulk to stay dry is on a countdown.
Installing the siding, with movement allowed for

Every cladding material moves with temperature and moisture, and every one has manufacturer-specified fastening, spacing and clearance requirements. Vinyl in particular hangs rather than being fixed tight, and needs clearance at openings.

Watch for: Panels nailed tight. It is the single most common installation error, it voids most warranties, and it produces the wavy, buckled wall that shows up in the first hot spell. Ask the crew directly how much movement they leave.
Trim, corners and finishing

Corner posts, J-channel, starter strip, soffit and fascia, and the trim at every opening. On fiber cement and wood, joints are flashed or sealed to a specification and cut edges are primed.

Watch for: Unprimed cut ends on fiber cement or wood. Every cut exposes raw material and every one needs sealing. It takes seconds during the job and is the origin of most premature edge failure.
Cleanup, magnet sweep and final walk

Old siding, offcuts and packaging are hauled away, and the site is swept for nails — including the lawn, the beds and the drive. Then walk every elevation with the contractor before final payment.

Watch for: Releasing the balance before the walk. Look along each wall from an angle for waviness, check the trim reveals are consistent, and confirm the flashing above openings is visible rather than caulked over.

Money

What does siding replacement cost?

A whole-house re-side is a five-figure project for most homes, and the spread is driven mostly by wall square footage and material choice — with vinyl at the bottom of the range and fiber cement, wood and stone veneer well above it. The cost guide breaks it down by material and home size.

See the full siding replacement cost guide — by material, size and region →

Straight answer

When siding replacement is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

The damage is confined to one or two elevations. Re-siding the two walls that face the weather and leaving the sheltered ones is a legitimate, common plan. The colour-match problem is the honest reason to think twice — but it is a reason to discuss, not an automatic argument for four walls.
The siding is sound and it is only the colour you dislike. On most materials other than vinyl, painting is a fraction of the cost of replacement and buys years. Painting vinyl is a genuine option too, with two hard constraints — you generally cannot go darker without risking heat distortion, and most manufacturers do not honour warranties on painted siding.
The real problem is a roof, a gutter or a grading issue. Water arriving at a wall from above or below will ruin new siding the same way it ruined the old. Find and fix the source first; the wall is the symptom.
You are selling within a year or two. Siding is one of the better-recovering exterior projects at resale, but "better recovering" is not "profitable". If the driver is the sale, a thorough wash, targeted repairs and paint usually put more in your pocket than a re-side does.
You are being pushed to sign tonight. Not a defect in your house — a defect in the offer. A price that only exists while the salesperson is in your living room was set so it could fall. Every honest siding quote survives a week.
Nobody has told you what the contingency is. If three contractors have all quoted a firm price with no mention of what happens when rot is found, none of them has priced the job honestly. Do not start with your walls about to be opened and no agreed number for what is under them.

Your options

Types of siding replacement

Siding materials

Vinyl, fiber cement, engineered wood, metal, stucco and veneers — eight guides, no dealer’s thumb on the scale.

Siding comparisons

Vinyl vs fiber cement, insulated vs standard, repair vs replace — head to head.

Decision guides

Budget vs premium, repair vs replace, DIY vs pro.

Compare siding options side by side →

Before you sign

What to check when hiring for siding replacement

What is your allowance for sheathing and water-barrier repair, and what is the unit price if we exceed it?

The most important question in siding. Nobody can know what is behind your walls, so the honest answer is a stated allowance plus a per-sheet and per-hour rate agreed in advance. A firm price with no mention of this is either padded or about to become a change order.
What water-resistive barrier are you installing, and how does it integrate with the window flashing?

This is the actual waterproofing of your house. You want a specific product and a specific lapping and taping method, and you want to hear how it ties into the flashing at every opening — not "we put house wrap on".
Will you photograph the walls after tear-off, before the new barrier goes on?

It is the only chance anyone will ever have to see the condition of your sheathing. Good contractors do this as a matter of course. It also makes any subsequent repair charge verifiable rather than a matter of trust.
Are you installing to the manufacturer’s published instructions, and will the warranty be registered?

Most material warranties are conditional on documented installation practice, and improper fastening voids them. Ask who registers the warranty and get a copy of the registration, not a promise.
Is disposal, dumpster and nail sweep included in this price?

A re-side generates a great deal of waste. It is a real line item, and it is one of the most commonly excluded ones — usually discovered when the skip appears on your invoice.
Is this price still valid in a week?

Ask it plainly, and note the answer. Same-day-only pricing in a high-ticket in-home sale is a structure, not a discount, and it is the clearest signal available that the opening number was never the real one.
Who is on the wall — your employees or a subcontracted crew — and who carries the workmanship warranty?

Both models produce excellent work. What matters is knowing whose insurance covers a ladder accident on your property and who you call in year three when a panel comes loose.

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Local pros

Siding Replacement near you

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Related work

Often done at the same time

Siding Repair

When it is damage, not a system failure

Siding Installation (New Builds & Additions)

Walls that have never been clad

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Go deeper

Guides & terms

Guides

Siding guides — materials, the installation process, colours

All siding guides →

Terms on this page

Housewrap, rainscreen, lap siding and weep holes, defined

Full siding glossary →

FAQ

Siding Replacement — questions people ask

Still have a question? Talk to our team →

How much should I budget on top of the quote for what is behind the siding?

Set money aside for it deliberately — a contingency on top of the contract price rather than a hope that none is needed. Older homes, homes with a history of leaks, and anywhere with recurring damage in one area are the higher-risk cases. What matters more than the exact percentage is that the rate is agreed before the walls are opened: an allowance in the contract, a per-sheet price for sheathing, and an hourly rate for repair labour. Contractors who work this way are not more expensive; they are just quoting the job that exists.

Is fiber cement worth the extra over vinyl?

It depends almost entirely on how long you are staying, and the reason you rarely hear that is worth knowing: nearly every page publishing total-cost-of-ownership figures on this question is written by a fiber cement dealer. Fiber cement costs meaningfully more installed and carries real recurring maintenance — periodic re-caulking, and repainting on a cycle measured in a decade or so. Vinyl costs less installed and has very little recurring cost. Over a long horizon the durability and resale arguments for fiber cement genuinely strengthen. Over a shorter one — say you expect to move within eight or ten years — the honest arithmetic favours vinyl, and no dealer-published comparison will land there. Our vendor-neutral head-to-head works the numbers through.

How long does a siding replacement take?

Most single-family re-sides run somewhere between a few days and a couple of weeks on site, driven by house size, storey height, material and weather. Fiber cement is slower to cut and hang than vinyl. Crews typically work one elevation at a time, so your house is never entirely stripped, and rot repair discovered at tear-off is the most common cause of an overrun.

Can new siding go over the old siding?

It is done, and on some assemblies it is permitted — but it is usually the wrong choice on a replacement job. Going over the old cladding means nobody inspects the sheathing, the water-resistive barrier is never renewed, and any moisture problem gets sealed inside the wall. It also adds thickness that has to be resolved at every window, door and corner. If the reason you are re-siding is water, layering over is the one approach that guarantees the cause stays where it is.

Do I need a permit to replace siding?

In many jurisdictions a like-for-like re-side is permitted work, and in some it is not. It more often becomes permitted when structural repair, added exterior insulation or a change of material is involved. Your building department is the authority; ask before work starts and establish in writing whether the contractor or you is pulling it.

What time of year is best for a re-side?

Mild, dry weather is easiest, which makes late spring through early autumn the busy season and, therefore, the more expensive and slower-to-book one. Off-season work is entirely feasible — most materials have installation temperature guidance rather than prohibitions, and sealants are the main constraint. The genuine risk in any season is rain arriving while a wall is open, which is a scheduling and site-protection question worth asking about directly.